Deceleration vibration

331stroker · 02-03-2008, 07:47 PM

I recently noticed at about 75-90 I have serious vibration on deceleration. I replaced the u-joints and still does it. When I replaced the u-joints all 4 of my DS bolts were finger tight. I also noticed that I can twist my DS about 3/8 of an inch each way before the tires turn it may be more like 3/4 in. any info would be great

USMC302 · 02-04-2008, 12:17 PM

Is it an aluminum driveshaft? What kind of hormanic balancer are you running?

331stroker · 02-04-2008, 08:41 PM

factory drive shaft not sure on the harmonic balancer

USMC302 · 02-04-2008, 09:18 PM

The stock balancers are crap IMO, they have a rubber seal that comes out over time and will be visible if it is, this will throw everything off balance, put a nice balancer and an aluminum DS on and your vibs will go away. The stock DS's aren't balanced to well either. Good luck.

02-03-2008, 07:47 PM	#1 (permalink)
331stroker Registered Member Join Date: May 2007 Posts: 9	Deceleration vibration I recently noticed at about 75-90 I have serious vibration on deceleration. I replaced the u-joints and still does it. When I replaced the u-joints all 4 of my DS bolts were finger tight. I also noticed that I can twist my DS about 3/8 of an inch each way before the tires turn it may be more like 3/4 in. any info would be great __________________ 1990 Lx 331 stroker, Holly System max 2, 190lph fuel pump, 30lb injectors,76mm mass air meter calibrated to the 30lb (i think?), long tube headers off-road h-pipe with glasspacks

02-04-2008, 12:17 PM	#2 (permalink)
USMC302 Registered Member Join Date: Apr 2001 Location: San Diego, Ca Posts: 1,265	Re: Deceleration vibration Is it an aluminum driveshaft? What kind of hormanic balancer are you running? __________________

02-04-2008, 08:41 PM	#3 (permalink)
331stroker Registered Member Join Date: May 2007 Posts: 9	Re: Deceleration vibration factory drive shaft not sure on the harmonic balancer __________________ 1990 Lx 331 stroker, Holly System max 2, 190lph fuel pump, 30lb injectors,76mm mass air meter calibrated to the 30lb (i think?), long tube headers off-road h-pipe with glasspacks

02-04-2008, 09:18 PM	#4 (permalink)
USMC302 Registered Member Join Date: Apr 2001 Location: San Diego, Ca Posts: 1,265	Re: Deceleration vibration The stock balancers are crap IMO, they have a rubber seal that comes out over time and will be visible if it is, this will throw everything off balance, put a nice balancer and an aluminum DS on and your vibs will go away. The stock DS's aren't balanced to well either. Good luck. __________________

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